AARN* DM 1X chainring (black) - BLUE LUG ONLINE STORE。aarn* DM 1X chainring (black) 44T パーツ。AARN* track chainring (black) - BLUE LUG GLOBAL ONLINE STORE。Ratio Fits Aero Direct Mount 1x Chainrings to ALL 12 & 13。。▫️新品未使用▫️44T薄歯(9〜12速対応)SRAMダイレクトマウントクランク用MADE IN Massachusetts, USA.